<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
    >
    </el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" v-if="draggable" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      show-checkbox
      node-key="catId"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      :props="defaultProps"
      :default-expanded-keys="expandedKeys"
      :expand-on-click-node="false"
      :draggable="draggable"
      ref="menuTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >
            Append
          </el-button>
          <el-button type="text" size="mini" @click="() => edit(data)">
            Edit
          </el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            Delete
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog
      :title="dialogTitle"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input
            v-model="category.productUnit"
            autocomplete="off"
          ></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
//这里可以导入其他文件（比如：组件，工具 js，第三方插件 js，json 文件，图片文件等等）
//例如：import 《组件名称》 from '《组件路径》';

export default {
  //import 引入的组件需要注入到对象中才能使用
  components: {},
  props: {},
  data() {
    return {
      pCid:0,
      draggable: false,
      updateNodes: [],
      maxLevel: 1,
      dialogTitle: "",
      dialogtype: "", //edit  add
      category: {
        name: "",
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        icon: "",
        productUnit: "",
        catId: 0,
      },
      menus: [],
      dialogVisible: false,
      expandedKeys: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  methods: {
    getMenus() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        this.menus = data.data;
        // console.log("成功获取到菜单数据", data);
      });
    },
    batchDelete(){
      let catIds = [];
      let checkedNodes = this.$refs.menuTree.getCheckedNodes();
      for(let i=0;i<checkedNodes.length;i++){
        catIds.push(checkedNodes[i].catId);
      }
      this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      }).then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false),
          }).then(({ data }) => {
            if (data && data.code === 0) {
              this.$message({
                message: "删除成功",
                type: "success",
                duration: 1500,
                onClose: () => {
                  this.getMenus();
                  // 需要默认展开的菜单
                  this.expandedKeys = [node.parent.data.catId];
                },
              });
            } else {
              this.$message.error(data.msg);
            }
          });
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
    batchSave() {
      //当前拖拽节点的 最新层级
      this.$http({
        url: this.$http.adornUrl("/product/category/update/sort"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.$message({
            message: "菜单顺序修改成功",
            type: "success",
            duration: 1500,
          });
        } else {
          this.$message.error(data.msg);
        }
        this.getMenus();
        // 需要默认展开的菜单
        this.expandedKeys = [this.pCid];
        this.updateNodes = [];
        this.maxLevel = 1;
        this.dialogVisible = false;
        this.pCid = 0;
      });
    },
    append(data) {
      this.dialogTitle = "添加菜单";
      this.dialogtype = "add";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;

      this.category.name = "";
      this.category.catId = null;
      this.category.icon = "";
      this.category.productUnit = "";
    },
    // 添加三级分类数据
    addCategory() {
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.$message({
            message: "菜单保存成功",
            type: "success",
            duration: 1500,
          });
        } else {
          this.$message.error(data.msg);
        }
        this.getMenus();
        // 需要默认展开的菜单
        this.expandedKeys = [this.category.parentCid];
        this.dialogVisible = false;
      });
    },
    edit(data) {
      this.dialogTitle = "编辑菜单";
      this.dialogtype = "edit";
      this.dialogVisible = true;

      // 发送请求获取当前节点最新数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
      }).then(({ data }) => {
        // console.log("成功获取到菜单数据", data);
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.icon = data.data.icon;
        this.category.productUnit = data.data.productUnit;
        this.category.parentCid = data.data.parentCid;
      });
    },
    editCategory() {
      var { catId, name, icon, productUnit } = this.category;
      var data = {
        catId,
        name,
        icon,
        productUnit,
      };
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        if (data && data.code === 0) {
          this.$message({
            message: "菜单修改成功",
            type: "success",
            duration: 1500,
          });
        } else {
          this.$message.error(data.msg);
        }
        this.getMenus();
        // 需要默认展开的菜单
        this.expandedKeys = [this.category.parentCid];
        this.dialogVisible = false;
      });
    },
    submitData() {
      if (this.dialogtype == "add") {
        this.addCategory();
      } else if (this.dialogtype == "edit") {
        this.editCategory();
      }
    },
    remove(node, data) {
      var ids = [data.catId];
      this.$confirm(`是否删除【${data.name}】菜单?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          console.log(data);
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            if (data && data.code === 0) {
              this.$message({
                message: "删除成功",
                type: "success",
                duration: 1500,
                onClose: () => {
                  this.getMenus();
                  // 需要默认展开的菜单
                  this.expandedKeys = [node.parent.data.catId];
                },
              });
            } else {
              this.$message.error(data.msg);
            }
          });
        })
        .catch(() => {
          this.$message({
            type: "info",
            message: "已取消删除",
          });
        });
    },
    allowDrop(draggingNode, dropNode, type) {
      // 被拖动的当前节点以及所在的父节点总层数不能大于三
      // 被拖动的当前节点总层数
      var level = this.countNodeLevel(draggingNode.data);
      // 当前正在拖动的节点+父节点所在的深度不大于3即可
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      // 找到所有子节点，求出最大深度
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].catLevel;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    handleDrop(draggingNode, dropNode, dropType, ev) {
      // 当前节点最新父节点id
      let pCid = 0;
      let sibings = null;
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        sibings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        sibings = dropNode.childNodes;
      }
      this.pCid = pCid;

      // 当前拖拽节点的最新顺序
      for (let i = 0; i < sibings.length; i++) {
        if (sibings[i].data.catId == draggingNode.data.catId) {
          // 如果遍历的是当前正在拖拽的节点
          let catLevel = draggingNode.level;
          if (sibings[i].level != draggingNode.level) {
            // 当前节点层级发生变化
            catLevel = sibings[i].level;
            // 修改子节点的层级
            this.updateChildNodeLevel();
          }
          this.updateNodes.push({
            catId: sibings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel,
          });
        } else {
          this.updateNodes.push({ catId: sibings[i].data.catId, sort: i });
        }
      }
    },
    updateChildNodeLevel(node) {
      for (let i = 0; i < node.childNodes.length; i++) {
        var cNode = node.childNodes[i].data;
        this.updateNodes.push({
          catId: cNode.catId,
          catLevel: node.childNodes[i].level,
        });
        this.updateChildNodeLevel(node.childNodes[i]);
      }
    },
  },
  //计算属性 类似于 data 概念
  computed: {},
  //监控 data 中的数据变化
  watch: {},
  // 生命周期 - 创建完成（可以访问当前 this 实例）
  created() {
    this.getMenus();
  },
  //生命周期 - 挂载完成（可以访问 DOM 元素）
  mounted() {},
  beforeCreate() {}, //生命周期 - 创建之前
  beforeMount() {}, //生命周期 - 挂载之前
  beforeUpdate() {}, //生命周期 - 更新之前
  updated() {}, //生命周期 - 更新之后
  beforeDestroy() {}, //生命周期 - 销毁之前
  destroyed() {}, //生命周期 - 销毁完成
  activated() {}, //如果页面有 keep-alive 缓存功能，这个函数会触发
};
</script>


<style  scoped>
</style>
